Pneumatic tire

Abstract

The present invention relates to a pneumatic tire comprising: a tread; one pair of shoulders respectively continued to both sides of the tread with the tread part as a center; one pair of sidewalls respectively continued to the shoulders; one pair of beads respectively continued to the sidewalls; a body ply formed on the inner sides of the tread, shoulders, sidewalls and beads; a belt and a cap ply part sequentially stacked between the inner side of the tread and the body ply; and an inner liner bonded to the inner side of the body ply, wherein in the inner liner, a sheet including a rubber component is positioned at the part of the body ply corresponding to the shoulders and the sidewalls, and a polymer film including a polyamide-based component is positioned at the part of the body ply corresponding to the tread.

1 . A pneumatic tire comprising:
 a tread   one pair of shoulders respectively continued to both sides of the tread with the tread as a center;   one pair of sidewalls respectively continued to the shoulders;   one pair of beads respectively continued to the sidewalls;   a body ply formed on the inner side of the tread, shoulders, sidewalls and beads;   a belt and a cap ply sequentially stacked between the inner side of the tread and the body ply; and   an inner liner bonded to the inner side of the body ply,   wherein in the inner liner, a sheet including a rubber component is positioned at the part of the body ply corresponding to the shoulders and the sidewalls, and a polymer film including a polyamide-based component is positioned at the part of the body ply corresponding to the tread.   
     
     
         2 . The pneumatic tire according to  claim 1 ,
 wherein on the basis of the cross section of the tread in the width direction,   the polymer film including a polyamide-based component contacts with the part of the body ply corresponding to the tread, and   the sheet including a rubber component is stacked such that it contacts with the part of the body ply corresponding to the shoulders and the sidewalls, and one side of the polymer film including a polyamide-based component of the inward direction of the pneumatic tire.   
     
     
         3 . The pneumatic tire according to  claim 1 ,
 wherein on the basis of the cross section of the tread in the width direction,   the sheet including a rubber component contacts with the part of the body ply corresponding to the tread, shoulders and sidewalls, and   the polymer film including a polyamide-based component is stacked on the opposite side of one side of the sheet including a rubber component that contacts with the part of the body ply corresponding to the tread.   
     
     
         4 . The pneumatic tire according to  claim 1 ,
 wherein on the basis of the cross section of the tread in the width direction,   sheets including rubber components are respectively bonded to both ends of the polymer film including a polyamide-based component.   
     
     
         5 . The pneumatic tire according to  claim 4 ,
 wherein on the basis of the cross section of the tread in the width direction,   the overlapped length between the end of the polymer film including a polyamide-based component and the sheet including a rubber component is 10 mm to 60 mm.   
     
     
         6 . The pneumatic tire according to  claim 1 ,
 wherein the sheet including a rubber component includes one or more kinds selected from the group consisting of synthetic rubber including butyl rubber or halobutyl rubber, and natural rubber.   
     
     
         7 . The pneumatic tire according to  claim 1 ,
 wherein the thickness of the sheet including a rubber component is 0.1 mm to 5 mm.   
     
     
         8 . The pneumatic tire according to  claim 1 ,
 wherein the polymer film including a polyamide-based component includes one or more compounds selected from the group consisting of polyamide-based resin; and copolymer including polyamide-based segments and polyether-based segments.   
     
     
         9 . The pneumatic tire according to  claim 8 ,
 wherein the content of the polyether-based segments in the polymer film including a polyamide-based component is 2 wt % to 40 wt %.   
     
     
         10 . The pneumatic tire according to  claim 8 ,
 wherein the polymer film including a polyamide-based component includes the polyamide-based resin and copolymer at a weight ratio of 6:4 to 3:7.   
     
     
         11 . The pneumatic tire according to  claim 8 ,
 wherein the polymer film including a polyamide-based component has a thickness of 2 μm to 400 μm.   
     
     
         12 . The pneumatic tire according to  claim 1 ,
 wherein the polymer film including a polyamide-based component includes one or more compounds selected from the group consisting of olefin-based polymer, olefin-based copolymer, and olefin-based polymer or copolymer grafted with dicarboxylic acid or acid anhydride thereof.   
     
     
         13 . The pneumatic tire according to  claim 1 ,
 wherein the polymer film including a polyamide-based component is bonded to the inner side of the body ply by an adhesion layer comprising a resorcinol-formalin-latex(RFL)-based adhesive, and having a thickness of 0.1 to 20 μm.